Scaffold-bracket.



A. W GUTHAT.

SGAFFOLD BRACKET.

APPLICATION rmm MAR. 22, 1909.

940,459, Patented m. 16,1909.

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UNITED STATES PATENT FFICE.

ALBERT W. GUTHAT, CF MILWAUKEE, WISCONSIN.

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Specification of Letters Patent.

Patented Nov. 16, 1909.

Application filed March 22, 1909. Serial No. 484,907.

companying drawings, which are a part of this specification.

This invention has for its object to pro vide a scaffold bracket whichmay be folded into small compass to be convenient for carrying fromplace to place and which when opened out for use will be strong anddurable.

Another object of the invention is to provide such a scaffold bracketwhich may be quickly collapsed without the necessity for removing pinsor bolts or the like.

i/Vith the above and other objects in view the invention consists in thescaffold bracket herein claimed, its parts and combinations of parts andall equivalents.

Referring to the accompanying drawings in which like characters ofreference indicate the same parts in the different views; Figure 1 is aperspective view of a scaffold bracket constructed in accordance withthis invention; Fig. 2* is a View thereof in its folded condition; Fig.3 is a detail view of the stirrup and knee connection for the arm andbrace; Fig. 4 is an end view thereof; and, Fig. 5 is a sectional viewthereof.

In these drawings 10 indicates a pair of parallel bars which havepivotally mounted between them on a bolt 11 near their upper ends aswinging arm 12 and likewise have pivotally mounted between them on abolt 13 near their lower ends a swinging brace 14. The pivoted end ofarm 12 is provided with a hook 15 to engage a suitable support on abuilding or other structure on which the bracket is to be used and saidhook is slotted at its end to receive the head of a lag bolt or the likewhen it is not convenient to engage the hook with a cross piece. Thehook member 15 is firmly secured to the arm 12 by a pair of bolts 16.The outer end of the arm 12 is provided with an upstanding lug 17 toprevent the scaffold board slipping off of the end of the bracket.

The detachable connection between the brace 14 and the arm 12 comprisesa knee member 18 which is preferably in the form of a casting secured byscrews or other substantial means to the under side of the arm 12, therepreferably being a lug 19 on the upper surface of the casting to enterinto a corresponding opening in the arm 12 and assist 1n preventing theknee member from sliding out of its position on the arm. The knee memberhas a beveled projection 20 which forms a seat with the plate portion ofthe knee member to receive the beveled end of the brace 14, there beinga second projection 21 against which the inner face of the brace fitswhen seated on the knee member. A stud 22 projects in an inclinedposition from the projection 21 so as to enter a countcrsunk socketplate 23 on the inner face of the brace 14 and a swinging stirrup member24 is pivotally mounted in a groove 25 formed in the upper surface ofthe knee member to swing from a position against the plate of the kneemember where it permits the brace to enter its seat to a position asshown in Fig. 3, where it stands approximately in alinement with thestud 22 and confines-the end of the brace to a tight hearing positionagainst its seat to prevent its becoming accidentally disengagedtherefrom. The stirrup 24 is in the form of a loop with its pivotal endextending across a groove 25 in the top of the knee plate and has anoffset or lug projection 26 to engage with the under side of arm 12which closes the groove and forms a stop for limiting the downward swingof the stirrup to its binding position. This assures the stirrup beingin a convenient position when it is desired to set up the bracket.

By means of this invention a scaffold bracket is provided which may bequickly and easily set up from a folded condition, it being onlynecessary to swing the arm 12 over to the position at approximatelyright angles to the pair of bars 10 and then swing the brace 14 into itsseat on the knee plate while the stirrup is being held against the kneeplate, and then permit the stirrup to drop into its binding connectionwhere it holds the brace against disengagement and the bracket thus setup may be quickly and easily connected by means of the hook 15 inposition for use, either by engaging the edge of a board or by engagingthe head of a lag screw or the like provided for the purpose in anysuitable support.

This scaflold bracket in use is strong and durable, the knee plate beingeffectively anchored to the arm 12 to prevent its losing its positionthereon and the brace being effectively locked to the knee plate againstaccidental disengagement. The folding of this scafli'old bracket doesnot require the removal of pins'or bolts, but the brace may be freelywithdrawn from its connection with the knee plate by merely swinging thestirrup to its upper position and drawing the brace from the stud 22.

What I claim as my invention and desire to secure by Letters Patent is:

1. A scaffold bracket, comprising an upright member, and arm and a braceconnected thereto, a knee plate on the arm forming a seat for the end ofthe brace, a stud on the knee plate entering an opening in the brace,and a swinging stirrup on the knee plate to engage the end of the braceand hold it against its seat and on the stud.

2. A scaffold bracket, comprising a pair of parallel bars, an arm memberpivotally mounted between the bars at one end, a lH'tltt. memberpivotally mounted between the bars at the other end, a knee platesecured to the arm and having a projection forming a seat for the end ofthe brace, a stiul projecting from the knee plate to enter an opening inthe end of the brace, and a stirrup pivotally mounted on the knee plateto engage the end of the brace and hold it against its seat and on thestud.

3. A scaflold bracket, comprising a pair of bars, an arm pivotallyconnected therebetween at one end, a brace pivotally connected betweenthe bars at the other end, a

slotted hook on the arm for engaging a support, a knee plate mounted onthe arm having a pair of projections to form a seat between them for theend of the brace, a stud on the knee plate to fit in a socket near theend of the brace, a lug on the knee plate countersunk in the arm toanchor the knee plate on the arm, a stirrup pivotally fitting in agroove on the top of the knee plate to engage the end of the brace andhold it against the seat and on the stud, and a lug on the stirrup toengage the arm and limit the degree of swing of the stirrup.

In testimony whereof, I alfix my signature, in presence of twowitnesses.

ALBERT V. GUTHAT.

Witnesses:

R. S. C. CALDWELL, ANNA F. SOHMIDTBAUER.

